When MMR is required on a drawing it is indicated on the drawing by placing the symbol in the tolerance frame either after the geometrical tolerance, after the datum letter or both

The symbol can be placed in the tolerance frame in the following ways:

Maximum Material Principle

The maximum material principle applies only to features with an AXIS or MEDIAN PLANE.

Figure 12.1: Example of applying maximum material principle

The actual measured diameter of the pin (figure 12.1) depicts the total increase in straightness tolerance. If the actual pin is 20 the allowed straightness tolerance is 0.1 but if the actual pin is 19.96 then...

Products & Services

Pulley blocks are assemblies that consist of a hook or shackle, swivel, bearing, sheaves, sprockets, pins and frame. They are suspended by a hoisting rope or load chain and are designed for a variety of lifting applications.